You want to stop all traffic. Allowing nothing in our out.
iptables -A INPUT -j REJECT
iptables -A OUTPUT -j REJECT
iptables -A FORWARD -j REJECT
Random thoughts and technical bits
You want to stop all traffic. Allowing nothing in our out.
iptables -A INPUT -j REJECT
iptables -A OUTPUT -j REJECT
iptables -A FORWARD -j REJECT